CUTOFF FILTERS FOR THE FAR IR

This paper proposes the use of polymer-crystal interference systems wh ose secondary transmission bands are eliminated by the scattering comp onents, with a random distribution of scattering centers in polyethyle ne, to cut off the short-wavelength part of the radiation of the far I R region. The spectral characteristics of two fabricated combined filt ers on the spectral region lambda > 100 mu m are presented. (C) 1998 T he Optical Society of America.